/* Bitgrid (domain Bitgrid, refonte/DEV-rf-mini-c.md): the home cards, the grid of 0 and 1. Prefixed classes, colours
   from the tokens of neurostim.css only. Cells of 44 px at least on a phone of 390 px (8 × 8). */
.bg-side, .bg-sub { font-size: var(--ns-size-md); font-weight: 400; }
.bg-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: var(--ns-space-4); margin: 0 0 var(--ns-space-5); }
.bg-card { display: flex; flex-direction: column; gap: var(--ns-space-2); }
.bg-card h2, .bg-card h3 { margin: 0; }
.bg-card h3 { margin-top: var(--ns-space-2); font-size: var(--ns-size-md); }
.bg-card p, .bg-card form { margin: 0; }
.bg-time { font-size: var(--ns-size-2xl); font-weight: 700; font-variant-numeric: tabular-nums; color: var(--ns-text-strong); }
.bg-boards { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 26rem), 1fr)); gap: 0 var(--ns-space-5); }
.bg-rules { margin-top: var(--ns-space-6); }
.bg-clock { margin: 0 0 var(--ns-space-3); text-align: center; font-size: var(--ns-size-xl); font-weight: 700; font-variant-numeric: tabular-nums; }

.bg-grid { width: min(100%, 28rem); margin: 0 auto var(--ns-space-4); table-layout: fixed; border-collapse: separate; border-spacing: 3px; background: var(--ns-border-strong); border-radius: var(--ns-radius); }
.bg-grid.bg-n6 { width: min(100%, 24rem); }
.bg-grid td { padding: 0; text-align: center; background: var(--ns-page); border-radius: var(--ns-radius-sm); }
.bg-grid td > span, .bg-grid input { display: flex; align-items: center; justify-content: center; width: 100%; aspect-ratio: 1; min-height: 0; font-size: clamp(1.1rem, 5.5vw, 1.6rem); font-variant-numeric: tabular-nums; }
.bg-grid input { margin: 0; padding: 0; text-align: center; font-family: inherit; font-weight: 600; color: var(--ns-ink); caret-color: transparent; cursor: pointer; background: transparent; border: 0; border-radius: var(--ns-radius-sm); }
.bg-grid input:focus-visible { outline: 3px solid var(--ns-focus); outline-offset: -3px; }
.bg-grid .bg-v0 { background: var(--ns-tint); }
.bg-grid .bg-v1 { background: var(--ns-accent-light); }
.bg-given span { font-weight: 800; color: var(--ns-text-strong); }
.bg-grid .bg-given { box-shadow: inset 0 0 0 2px var(--ns-border-strong); }
.bg-grid .bg-bad, .bg-grid .bg-bad input { color: var(--ns-error); background: var(--ns-error-soft); }
.bg-actions { display: flex; flex-wrap: wrap; gap: var(--ns-space-3); justify-content: center; }